Decay $B_s\to \varphi {\ell }^{+}{\ell }^{-}$ in covariant quark model

Abstract

Our article is devoted to the study of the rare $B_s\to \varphi {\ell }^{+}{\ell }^{-}$ decay where $\ell =\mu ,\tau$. We compute the relevant form factors in the framework of the covariant quark model with infrared confinement in the full kinematical momentum transfer region. The calculated form factors are used to evaluate branching fractions and polarization observables in the cascade decay $B\to \varphi (\to K^{+}{K}^{-}){\ell }^{+}{\ell }^{-}$. We compare the obtained results with available experimental data and the results from other theoretical approaches.

16 pages, 13 figures. arXiv admin note: text overlap with arXiv:1511.04887

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• Semileptonic decays of $B_c$ mesons into charmonium states
• Angular distribution of the FCNC process $B_c\to D_s^{\ast }(\to D_s\pi ){\ell }^{+}{\ell }^{-}$
• Exploring New Physics in transition $b\to s{\ell }^{+}{\ell }^{-}$ through different $B_c\to D_s^{(\ast )}{\ell }^{+}{\ell }^{-}$ observables
• $B_c^{\ast }$ meson parameters and radiative decay width within the covariant confined quark model
• b-s Anomaly Decays in Covariant Quark Model
• $B\to \rho$ Decay Form Factors from Covariant Confined Quark Model
• $B_s\to K^{\ast 0}$ decay form factors from covariant confined quark model
• Decay $B_c^{+}\to D_{(s)}^{(\ast )+}{\ell }^{+}{\ell }^{-}$ within covariant confined quark model
• Constraining ${\lambda }_{B_s}$ by $B_s\to {\gamma }^{\ast }$ and $B_s\to \varphi$ form factors